Year 9 Muscles worksheet Completion of this worksheet will help you understand the function of muscles when we exercise. Before you start you must visit and complete the interactive muscle session by visiting http://www.bbc.co.uk/science/humanbody/body/interactives/3djigsaw_02/index.shtml?muscles Tools This quiz requires you to log in. Please enter your Quia username and password. Quiz Log In Username: Password:   Quiz created by: David Yates This activity was created by a Quia Web subscriber. To learn how to make your own, just like this, click here.